Not all septic leach or drain fields are not the same, but then again they are. Here are a few examples of the different design types: 1) The conventional type, consisting of a two-chambered septic tank, distribution box, stone, sand and perforated plastic piping. 2) The raised mount system type, consisting of a three-chambered septic tank. The third chamber, a pump chamber raised system built up on sand, distribution box, [...]